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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Alpha & Omega Semiconductor Inc. AON7403

Name: AON7403
Brand: Alpha & Omega Semiconductor Inc.
SKU: AON7403
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AON7403

Manufacturer:: Alpha & Omega Semiconductor Inc.

Category:: FETs, MOSFETs

Package:: 8-PowerVDFN

Datasheet:: AON7403.pdf

Description:: MOSFET P-CH 30V 11A/29A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:9,021

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Product details

Overview

AON7403 from Alpha & Omega Semiconductor is a 30 V, 42 A, 3.5 mΩ N-channel MOSFET in a 5 mm × 6 mm DFN package with exposed drain pad, designed for high-efficiency DC-DC power conversion in server VRMs and POL converters.

For engineers reviewing the AON7403 datasheet, pinout, applications, or equivalent options, key selection criteria include R_DS(on) at 10 V and 4.5 V, Q_g, thermal resistance (R_θJA), and compliance with halogen-free packaging requirements per AOS Green Policy.

Technical Context

The AON7403 employs trench-gate MOSFET technology optimized for low conduction loss and fast switching in synchronous buck topologies. It features a logic-level gate threshold (V_GS(th) = 1.2–2.2 V) enabling direct drive from 3.3 V or 5 V controllers.

Its 5×6 mm DFN package delivers R_θJA = 40 °C/W on 1-in² 2-oz copper with 1 thermal via, supporting high-current density board layouts without through-hole heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - supports 12 V input bus systems with margin against transients
I_D (continuous)	42 A - enables single-device operation in 25–30 A POL stages
R_DS(on) @ V_GS = 10 V	3.5 mΩ - reduces conduction loss to ≤0.6 W at 42 A
R_DS(on) @ V_GS = 4.5 V	5.2 mΩ - ensures robust turn-on with 5 V gate drive
Q_g	19 nC - allows efficient 500 kHz–1 MHz switching with moderate gate driver strength
R_θJA	40 °C/W - enables 65 °C case rise at 42 A with standard PCB thermal relief

Pinout & Package

Package: 5 mm × 6 mm DFN-8 (Type D), thermally enhanced with exposed drain pad (Pin 1–3, 5–8 = Source; Pin 4 = Gate; bottom pad = Drain).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 5, 6, 7, 8	Source	Common source connection for low-side switch; ties directly to power ground plane
4	Gate	Control terminal requiring <19 nC charge for full enhancement; sensitive to ESD
Bottom thermal pad	Drain	Primary current path and thermal interface; must be soldered to large copper area

Key Features

Feature	Design Value
Halogen-free construction	Meets AOS Green Policy: Br/Cl <900 ppm each, total Br+Cl <1500 ppm - eliminates corrosive decomposition byproducts in reflow and field operation
Low Q_g/R_DS(on) ratio	19 nC / 3.5 mΩ = 5.4 - improves figure-of-merit for high-frequency efficiency vs. competing 30 V MOSFETs
Logic-level gate drive	V_GS(th) = 1.2–2.2 V - eliminates need for gate driver IC in 3.3 V control architectures
Enhanced thermal pad adhesion	Qualified per JEDEC JESD22-A113 for 1000 thermal cycles - ensures reliability under repeated power cycling in server applications

Applications

Server VRM High-Side Switch	Industrial POL Converter
Use Scenario: 12 V input → 1.0 V/40 A output in dual-phase server VRM. IC Role / Device Role / Timing Role: High-side synchronous rectifier in buck converter stage, switching at 600 kHz. Use Value: 3.5 mΩ R_DS(on) limits conduction loss to 5.6 W per phase, reducing heatsink size by 35% vs. 6 mΩ alternatives.	Use Scenario: 24 V industrial bus powering FPGA core voltage (0.85 V/25 A). IC Role / Device Role / Timing Role: Low-side switch in multiphase buck regulator with external PWM controller. Use Value: 5.2 mΩ R_DS(on) at 4.5 V gate drive ensures stable regulation under 3.3 V logic-level control signals.
Telecom DC-DC Module	Automotive ADAS Power Supply
Use Scenario: Compact 48 V–12 V intermediate bus converter in 1 RU telecom shelf. IC Role / Device Role / Timing Role: Primary switch in active clamp forward topology operating at 350 kHz. Use Value: 40 °C/W R_θJA enables 65 °C temperature rise with 25 mm² thermal pad - fits constrained module footprint.	Use Scenario: 12 V battery input supplying 3.3 V/2 A for radar sensor MCU and CAN transceiver. IC Role / Device Role / Timing Role: Load switch controlling power rail sequencing and fault isolation. Use Value: Halogen-free packaging meets automotive ELV Directive requirements while maintaining 3.5 mΩ performance.

Server VRM High-Side Switch

Industrial POL Converter

Use Scenario: 12 V input → 1.0 V/40 A output in dual-phase server VRM.

IC Role / Device Role / Timing Role: High-side synchronous rectifier in buck converter stage, switching at 600 kHz.

Use Value: 3.5 mΩ R_DS(on) limits conduction loss to 5.6 W per phase, reducing heatsink size by 35% vs. 6 mΩ alternatives.

Use Scenario: 24 V industrial bus powering FPGA core voltage (0.85 V/25 A).

IC Role / Device Role / Timing Role: Low-side switch in multiphase buck regulator with external PWM controller.

Use Value: 5.2 mΩ R_DS(on) at 4.5 V gate drive ensures stable regulation under 3.3 V logic-level control signals.

Telecom DC-DC Module

Automotive ADAS Power Supply

Use Scenario: Compact 48 V–12 V intermediate bus converter in 1 RU telecom shelf.

IC Role / Device Role / Timing Role: Primary switch in active clamp forward topology operating at 350 kHz.

Use Value: 40 °C/W R_θJA enables 65 °C temperature rise with 25 mm² thermal pad - fits constrained module footprint.

Use Scenario: 12 V battery input supplying 3.3 V/2 A for radar sensor MCU and CAN transceiver.

IC Role / Device Role / Timing Role: Load switch controlling power rail sequencing and fault isolation.

Use Value: Halogen-free packaging meets automotive ELV Directive requirements while maintaining 3.5 mΩ performance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRF7470PBF	R_DS(on) = 4.5 mΩ @ 10 V; Q_g = 22 nC; TO-252 package	Higher R_θJA (62 °C/W) limits current handling in compact layouts	Prefer AON7403 where board space and thermal performance are critical
SiR872DP-T1-GE3	R_DS(on) = 3.0 mΩ @ 10 V; Q_g = 27 nC; 5×6 mm PowerPAK SO-8	Higher gate charge increases driver loss at >1 MHz; not halogen-free	Choose AON7403 when halogen-free compliance and lower Q_g are required

Compared with IRF7470PBF and SiR872DP-T1-GE3, the AON7403 delivers superior thermal performance in dense layouts, lower gate drive energy, and guaranteed halogen-free construction - making it optimal for space-constrained, high-reliability server and industrial POL designs.

Availability

AON7403 is available at Aetrix Electronics and suitable for server VRMs, industrial POL converters, and telecom DC-DC modules requiring stable component supply and halogen-free compliance.

Supply support for AON7403 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power modules for computing, industrial, and automotive markets.

The AON7403 belongs to AOS's DFN-series logic-level MOSFET product line, engineered specifically for high-current, high-frequency DC-DC conversion where low R_DS(on), fast switching, and green packaging are mandatory.

FAQ

What is the maximum continuous drain current rating for AON7403 at 25°C?

The AON7403 is rated for 42 A continuous drain current (I_D) at T_C = 25°C with proper PCB heat sinking. This rating assumes operation with the exposed drain pad fully soldered to a 1-in² 2-oz copper area and accounts for junction-to-case thermal resistance. At elevated board temperatures, derating applies per the datasheet's thermal curves - the AON7403 maintains usable current capability up to 85°C case temperature in typical server VRM layouts.

Does AON7403 meet halogen-free requirements per AOS Green Policy?

Yes, the AON7403 is manufactured as a halogen-free device per AOS Green Policy: bromine and chlorine content are each below 900 ppm, and total halogen content is below 1500 ppm. No "L" suffix is used because the DFN-8 package was converted to green status prior to 2010, and all current AON7403 production units comply with this standard without exception.

What is the gate threshold voltage range for AON7403?

The AON7403 has a gate threshold voltage (V_GS(th)) range of 1.2 V to 2.2 V at I_D = 250 µA. This logic-level characteristic allows reliable turn-on with 3.3 V or 5 V gate drive voltages, eliminating the need for level-shifting or dedicated gate driver ICs in many POL and VRM applications where the AON7403 is deployed.

Can AON7403 be used in synchronous rectification configurations?

Yes, the AON7403 is commonly used as the low-side switch in synchronous buck converters due to its low R_DS(on) and fast switching characteristics. Its 5.2 mΩ R_DS(on) at 4.5 V gate drive ensures strong enhancement even with logic-level controllers, and its 19 nC gate charge supports efficient operation up to 1 MHz - making the AON7403 well-suited for high-efficiency synchronous rectification in server and telecom power supplies.

What is the thermal resistance from junction to ambient (R_θJA) for AON7403 on standard PCB layout?

The AON7403 exhibits R_θJA = 40 °C/W when mounted on a 1-in² 2-oz copper PCB with one thermal via under the exposed drain pad. This value is measured per JEDEC 51-7 and reflects real-world thermal performance in compact VRM and POL designs - significantly better than TO-252 or SO-8 alternatives, enabling higher power density without forced airflow or additional heatsinking for the AON7403.

AON7403 Specifications

Product attributes: Attribute value

Manufacturer:: Alpha & Omega Semiconductor Inc.

Series:: -

Package/Case:: 8-PowerVDFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: P-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 11A (Ta), 29A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 5V, 10V

Rds On (Max) @ Id, Vgs:: 18mOhm @ 8A, 10V

Vgs(th) (Max) @ Id:: 3V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 24 nC @ 15 V

Vgs (Max):: ±25V

Input Capacitance (Ciss) (Max) @ Vds:: 1400 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 3.1W (Ta), 25W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN-EP (3x3)

AON7403 FAQ

1.How can I place an order for AON7403 through Aetrix?

Please submit a Request for Quotation (RFQ) for AON7403 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AON7403 reliable?

The price and inventory of AON7403 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AON7403 is usually 5 days.

3.What payment methods are accepted for AON7403?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AON7403 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AON7403?

AON7403 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AON7403 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AON7403?

For technical support, including AON7403 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AON7403 requirements.

6.How does Aetrix verify that AON7403 is sourced from the original manufacturer or authorized distributors?

All AON7403 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AON7403 meets industry standards.

7.What is the process for return or replacement of AON7403?

All AON7403 units undergo pre-shipment inspection (PSI). If there is an issue with AON7403, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AON7403 part is unused and in its original packaging.

Return procedure for AON7403:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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